Burris FF2 lens fogging up?

[cassga]

While hunting this past weekend in GA, I had a group of longbeard come in.  When i finally maneuvered and got into postion, I went to put the bead on the lead longbeard and my lens was completely fogged up. I could see the red dot fine, but was unable to see what I was aiming at.  After a short panic, I was able to ease my thumb up to the lens and wipe it clear enough to see the turkey's head, and got my shot off.  Bird went down and all is well now, but just curious how many have had issues with a fogged up lens.  Had I only been offered a brief window to shoot, it may have cost me the bird.  As it usually is this time of year in GA, it was hot a muggy.  Any tips to prevent fogging on the Burris FF2 lens?

[gobblergls]

Any chance you  went to the hunt in  a cool, air conditioned truck?  With the humidity in GA, I have had sunglasses fog up when leaving cool buildings.

[cassga]

This was well over an hour after leaving the truck.  This is the first time this season that I have noticed it being fogged up and and it came at the most inconvenient time! I have had scopes fog up before, guess I just need to be aware and make sure before crunch time.

[mightyjoeyoung]

Stop breathing so heavy?   

[Skeeterbait]

May not have helped in this case, but realize that with a reflex sight, the dot does not have to be in the center of the glass.  if you can see the dot and put it on the target the gun is aimed true even if the dot is in the corner of the window.  So if the corners are not fogged and you can reposition your head to put the dot in that corner your good to fire away.

[mightyjoeyoung]

I shoot mine with both eyes open.  It wouldnt matter if the glass was painted black on the front side, I can still see the dot with no issues, my depth perception is not affected, and my peripheral vision is alot wider than if I were to close my weak eye.

[BurrisOptics]

This is interesting.  I'll have to try and duplicate this problem.  It might be tough to do but I'll give it a try.  One thing to keep in mind is that having glass fog on the exterior side is not at all unusual.  Grab any optical item and breathe on it and you'll see what I mean.  The mystery is why did it fog.  My initial thought on this is that regardless of what you would have had on your gun it would have been fogged.  I think it had to do with the conditions you were hunting in rather than the sight but I need to look into it more.  Did you have a pair of binose with you?  If so did you happen to notice if they were also fogged?  Did you have the cover on your sight? 

[Skeeterbait]

  My initial thought on this is that regardless of what you would have had on your gun it would have been fogged.   

I suspect so also.  External condensation on glass is easy when there is a temperature differential between the glass and the air on humid days.  Doesn't take much differential on some days.  This is a totally different issue than internal scope fogging which is a definite indication of fault with the scope.  An open lens reflex is going to do this sometimes dispite our best efforts.  On humid days you have to keep a check on it before the time is critical.  And make sure you do not breathe on it.

There are anti-fog treatments for eye glasses on the market that work fairly well.  However I would not want to use them unless BurrisOptics says they are safe for the coatings on the glass.  Reflex sights have mirrorized coatings that eye glasses don't.

And MightyJoe is absolutely correct that a open lens reflex sight can and should be used with both eyes open.  It is a strange optical effect but you could tape over the front of the sight so you cannot see through it, keep both eyes open and focus on the target, the one eye sees the dot and the other eye sees the turkey and the brain puts the too together.  Takes a bit of practice but it works.  The closer the sight is to the eye and thinner the frame around the lens the easier it is.

[BurrisOptics]

There's no issue with using anti fog spray on our lenses.  The coating will be just fine. 

[whiskey]

There are some impressive "durable anti-fog coatings" being developed in the glass industry. They are currently marketed towards architectural and refrigerated glass applications, but I am hopeful they will eventually find their way to hunting optics. These are not user applied coatings, but something like RainX can be helpful too.

[mightyjoeyoung]

Four words...Cat Crap Antifog paste.